The simple fact is, this is a mass-multiplayer game, with gripping and interesting group play, solo in essence goes against that and doesn't offer the full range of play that you get in an alliance.
For a comparative example, think of World of Warcraft, it is a Mass-multiplayer game, the top end content in WoW is ALL 10/25 player based for PvE, and then 2v2/3v3/5v5 for PvP with only the 3v3/5v5 really being recognised for ingame titles etc (details may be out of date as i haven't played WoW since Wotlk), but to get to my point, in WoW you can't get the full experience out of the game by playing alone, due to it being a multiplayer game.
The same is here, imho the best bit of this game is alliances, being allied, making new friends, working together towards a goal. Solo play goes against the best bits of the game imo, you work alone or with at most 2 others (your pnaps, solo groups are just a pathetic concept of people who are too incompetent at socialising to be allied 24/7 and just use solo groups for their own convenience) it loses the best bits, working with 19 others towards the same goal should be the driving force behind the gameplay.
I've probably repeated myself a bit there
but anyway, if the game was intended for mass solo play, why were alliances put in with so many advantages over solos?
It is an alliance game, always has been, always will be.
What the game does need, is an actual advertising campaign, not ingame changes, the game works, but is intended for a playerbase double/triple the current size, thus issues such as bottom feeding etc, are more prominent due to lower player numbers.